#mask {
	height: 100%;
	width: 100%;
	background: #000000;
	position: absolute;
	top: 0;
	-moz-opacity:0.75;
	-khtml-opacity: 0.75;
	opacity: 0.75;
	filter: alpha(opacity=75);
}

#popup {
	margin: 0 auto;
	border: 1px solid #000000;
	background: #ffffff;
	position: absolute;
	top: 200px;
	left: 25%;
}